refactoring: using an auxiliary feature for win conditions

src/main/c/GameTic_Tac_Toe/game.c

@@ -17,13 +17,19 @@ void displayBoard() {
         if (i < 2) printf("---------\n");
     }
 }
-
+char checkLine(char a, char b, char c) {
+    if (a == b && b == c) return a;
+    return ' ';
+}
 // Funktion zur Überprüfung des Gewinners
 char checkWinner() {
   // Überprüfe horizontale und vertikale Linien
-    for (int i = 0; i < 3; i++) {
-        if (board[i][0] == board[i][1] && board[i][1] == board[i][2]) return board[i][0];
-        if (board[0][i] == board[1][i] && board[1][i] == board[2][i]) return board[0][i];
+     for (int i = 0; i < 3; i++) {
+        char horizontalWinner = checkLine(board[i][0], board[i][1], board[i][2]);
+        char verticalWinner = checkLine(board[0][i], board[1][i], board[2][i]);
+
+        if (horizontalWinner != ' ') return horizontalWinner;
+        if (verticalWinner != ' ') return verticalWinner;
     }
      // Überprüfe diagonale Linien
     if (board[0][0] == board[1][1] && board[1][1] == board[2][2]) return board[0][0];